Nanotech 2010

Cadmium Selenide Incoporrated into Polymers and as Core in Coreshell Nanomaterials

M.J. Moloto, T.P. Mthethwa, P.B. Rakgalakane, B.P. Khoza
University Of Johannesburg, ZA

Keywords: coreshell nanomaterials, quantum dots, cadmium selenide

Abstract:

Cadmium selenide is a semiconducting material occurring as a binary compound of cadmium and selenium. It has been prepared mainly as nanoparticles using variety of methods. CdSe is being developed in research for use in opto-electronic devices, laser diodes, nanosensing, and biomedical imaging.1 They are also used being tested for use in high-efficiency solar cells.2,3 In this work we report the incorporation of CdSe nanoparticles prepared using TOPSe and CdCl2 in hexadecylamine at 120 °C into the polymer PMMA using electrospinning technique in order to make polymer fibre containing dispersed CdSe quantum dots. Variation of percentages of CdSe nanoparticles into the polymer cause coiling of fibres and decreased luminescence intensity. CdSe nanoparticles were also used as core in the synthesis of CdSe/ZnO and CdSe/PbS nanomaterials using conventional route capped by thioglycerol, hexadecylamine and trioctylphosphine oxide. Results reveal the tendency of CdSe to form part of the core with an exception of PbS nanomaterials in which CdSe tends to bind on the surface of PbS. The optical properties are evident of absorption in the near infrared region for CdSe/PbS as compared to CdSe/ZnO showing predominance of CdSe features in absorption band edges which is red shifted in relation to CdSe nanoparticles to about 680 nm. The materials prepared have been characterised by UV-Visible and photoluminescence spectroscopy and electron microscopy (SEM and TEM) which will be discussed.
 
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